New Discount Function is Causing my Scripts to Error

[sparky_kr]

We've had a line_item script running for a good while now, running with no errors. However, today as I'm implementing an App Discount via Functions, the script is returning a production error of "Can't convert nil to Decimal", even though there's no number handling.

Edit: Did some more testing, and I published a barebones line_item script that did nothing `Output.cart = Input.cart` and I still got the error.